Here's another old school track I'm working on. This one is a custom USHRA pulling/monster truck event, based on a custom track that was made by Blizzard several years ago for MTM2:
For reference, here's the original track Blizzard made for MTM2, that inspired this one:

Are you not able to spawn a truck at all, or just at startup? Since .load files are placed on the track (the pulling sleds & crushable cars), you won't be able to spawn a truck automatically when you start the game (like in some other tracks). You'll need to use the garage (it should be near where you start), or the drop-down menu at the top of the screen.

If you have the pulling sleds downloaded and installed in your game, they should automatically spawn on the track. The automatic spawn points are set up for the green pulling sleds, though, so they may not work with the black pulling sleds.